Expandable mailer made with DuPont Tyvek material delivers the best possible protection at a shipping-cost-saving weight. Inserting and removing contents is easy because of its horizontal open side orientation. Self-adhesive Redi-Strip closure provides a secure peel-and-press seal. Clean crisp look makes a professional impression. Lightweight - 14 lb. Seam Type: Center Flap Type: Square Trade Size: 15 Security Tinted: No.